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v2.4.1.9

Subsequent Event (Details) (Workmen's Auto Insurance Company [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended | 0 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jan. 12, 2015 | Jan. 02, 2015
Subsequent Event [Line Items] |  |  |  |
Statutory surplus amount | $ 7.8 mcy_StatutoryAccountingPracticesStatutoryCapitalSurplusAmount |  |  |
Net premiums earned | 22.4 mcy_StatutoryAccountingPracticesNetPremiumsEarned | 34.3 mcy_StatutoryAccountingPracticesNetPremiumsEarned |  |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Consideration paid in cash |  |  |  | 8 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount held in escrow |  |  |  | 2 mcy_BusinessCombinationConsiderationTransferredAmountHeldInEscrow / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term for escrow security payment |  |  |  | 2 years
Capital contribution amount |  |  | $ 15 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mcy_WorkmensAutoInsuranceCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Statutory Accounting Practices, Net Premiums Earned + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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